Continuous gas flow trocar assembly

ABSTRACT

A trocar assembly for providing a pressurized insufflation fluid into a patient cavity and for providing sealable access to the patient cavity by a surgical instrument. The assembly comprises an inner tubular member having a proximal end and a distal end. An outer tubular member is disposed about the inner tubular member, the outer tubular member having a proximal end and a distal end. The distal end of the inner tubular member and the distal end of the outer tubular member define a trocar seal nozzle arranged therebetween.

CROSS-REFERENCE TO RELATED APPLICATIONS

The subject application is a divisional of U.S. patent application Ser.No. 10/441,149, filed May 17, 2003, which claims the benefit of priorityto U.S. Provisional Application Ser. No. 60/461,149, filed Apr. 8, 2003.Each of the foregoing applications is expressly incorporated herein byreference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to medical devices and more particularlyto access devices and particularly their seal arrangements and closuremechanisms applicable to such medical devices.

2. Prior Art

Laparoscopic surgery is now standard procedure in hospitals today.Abdominal operations are being performed with narrow elongatedinstruments inserted through small incisions into interior portions ofthe body. Such laparoscopic procedures are now considered the treatmentof choice for operations such as the removal of the gall bladder,spleen, adrenal glands, uterus and ovaries. Such laparoscopic proceduresare accomplished via access through a device typically known as a trocarwhich facilitates the introduction of laparoscopic instruments into theabdomen of the body. The introductions of these instruments typicallyare done in regions which include a fluid under pressure. In theabdomen, this fluid may be a gas such as insufflation gas. It isdesirable to provide for the introduction of a surgical instrument intothe body cavity without permitting the reduction or loss of theoperative pneumoperitoneum.

During typical laparoscopic procedures, the surgeon makes three to foursmall incisions, usually no larger than about twelve millimeters. Thesefacial incisions are made with the trocar devices. The trocar makes theincision and then provides a tubular access for other instruments to beinserted into the abdominal space. The trocar also provides a means toinsufflate the abdominal cavity with a low pressure gas, typicallycarbon dioxide, so that the surgeon has an open interior space in whichto work. The trocar must provide a means to maintain the internal gaspressure with some sort of a seal between the trocar and the medicalinstrument he is utilizing, and still allow those surgical devices to beinserted and withdrawn. Such surgical instruments introduced through thetrocar tube and into the abdomen may include scissors, graspinginstruments, occluding instruments, cauterizing units, cameras, lightsources and other surgical instruments.

Currently, insufflation is performed by providing a regulatedpressurized gas to the peritoneal cavity via the trocar cannula. Thisgas, typically carbon dioxide, is supplied to a connection on the sideof the trocar tube by a flexible hose thereattached. The medicalinstrument going through the trocar or innermost tube thereof, should besealed relative to the trocar so that insufflation gas will not escapefrom the patient.

Sealing mechanisms are utilized within the trocar to prevent the escapeof fluid. Such mechanisms said typically comprised an aperture or septumvalve which has functioned to form a seal around the outer surface ofthe instrument positioned and moved within the trocar or access device.When the instrument is inserted, or is removed, the hole in the sealcontracts to restrict outward gas flow. Such seals usually accept arange of instrument diameters and usually do not totally restrictoutward gas flow when these instruments are retracted. Other types ofvalves and seals include flapper valves or trap type doors which arespring loaded. When a instrument penetrates the trocar tube accessdevice the instrument pushes the door open. However when the instrumentis retracted, such a trap door or valve may interfere with the removalof the instrument or any tissue being transported thereby.

Certain problems arise with the types of seals utilized in these trocardevices. Certain seals only work for a limited range of instrumentdiameters. Certain other seals inhibit the motion of the instrument asit is being inserted or as it is being withdrawn from the trocar.Typically the seals do not last through any procedures because they aresubject to wear and tearing. Those prior art seals also may ofteninterfere with the removal of the instrument and/or any tissue beingwithdraw from the patient utilizing that particular instrument.

It is an object of the present invention to overcome the disadvantagesof the prior art.

It is a further object of the present invention to provide a seal whichwill work with a wide range of instrument sizes, shapes and diameters.

It is a further object of the present invention to provide a universaltrocar seal for use without the seal interfering with or touching anyinstrument utilized therewith.

It is still yet a further object of the present invention to provide aseal which will eliminate any motion restriction for those instrumentsinserted therethrough, and permit improved tactile feedback to thesurgeon.

It is yet a further object of the present invention to provide a sealwhich may be automatic in its function, as well as being controllableand adjustable, by or according to the needs of the attending surgeon.

It is a further object of the present invention to provide a path forexiting liquid and gas and a collection arrangement therefore, with aprevention of any splash therewith.

It is still yet a further object of the present invention to provide aseal which will not interfere with the removal of tissue from theinterior of a body cavity as it moves through the trocar.

It is still yet a further object of the present invention to allowinstruments with an irregular outside surface configuration to stillmaintain a seal with the trocar.

It is yet another object of the present invention to allow an instrumentand a trailing suture to be utilized as in a surgical procedure such asa Nissen fundal placation.

It is yet a further object of the present invention to permit the use oftwo instruments with a combined OD less than the ID of the cannulawherein one instrument could be used for grasping and stabilizing tissuethe other instrument used for cutting that stabilized tissue orcannulation (cholangiogram) of a ductal tissue without the loss of gasor the use of a further trocar.

BRIEF SUMMARY OF THE INVENTION

The present invention comprises a continuous gas flow trocar arrangementwhich provides a completely open aperture for the introduction of asurgical instrument and its access to the peritoneum without anyphysical contact between the innermost surface of the trocar assemblyand the surgical instrument being introduced therewithin or withdrawntherefrom. The trocar assembly of the present invention comprises anelongated outer tubular member having a first or proximal end and asecond or distal end. The assembly includes an internal tubular member,which may be identified as a cannula, having an open proximal end and anopen distal most end. An annular seal is disposed between the outertubular member and the outer walls of the inner tubular member at theproximal end of the assembly. An insufflation gas flow supply conduit isin fluid communication with the annular plenum chamber arranged betweenthe outer surface of the inner tubular member and the inner surface ofthe outer tubular member. Pressurized gas is thus presented to thecontinuous gas flow trocar via the insufflation gas conduit. Theinsufflation gas flows through the annular chamber between the inner andouter tubular members and is discharged into the abdomen of the patientat the second or distal end and of the trocar assembly.

The distal end of the trocar assembly defines an annular array of fluiddirecting jets which direct the insufflation gas flow through theannular nozzle arrangement preferably as a cone shaped gas stream orwall of gas exiting those jets or nozzles. In this continuous gas flowtrocar assembly, the force produced by the jet fluid is counterbalancedby the pressure inside the peritoneum of the patient. This balance isachieved when the abdomen pressure by the inflow of insufflation gas isreduced until the desired peritoneal pressure just balances the inletair flow force. The inlet gas flow will maintain the correctinsufflation pressure within the patient's abdomen and willautomatically adjust to allow laparoscopic medical instruments to bepassed through the inner tubular member into the peritoneum and to beretrieved from the abdomen through the inner tubular member of thetrocar assembly. Outflow of pressurized fluid is effected between themedical instrument within the inner tubular member and the inner wallsof the inner tubular member and exiting out the access port at theproximal end of the trocar assembly. In the event that the instrument orinstruments inserted through the trocar completely or nearly completelyfills the inner tubular trocar member, the gas inflow is reduced to zeroto maintain the desired, controlled, peritoneum pressure.

The medical instrument accessing the peritoneum through the innertubular member of the trocar assembly and into the patient merely passesthrough the gaseous fluid wall created by the annular nozzles at thedistal most end of the trocar assembly. Manipulation of that medicalinstrument is not interfered with nor is removal of any tissue throughthat inner tubular member hindered in any way by any trap door oroverlapping seal arrangement typical of the prior art. The cannula orinner tubular member may be movable relative to the outer tubular memberof the trocar assembly to permit changing of the flow of gases throughthe annular nozzle arranged within the distal end of the trocarassembly.

The invention thus comprises a trocar assembly for providing apressurized insufflation fluid into a patient cavity and sealable accessto the patient cavity by a surgical instrument, comprising: an innertubular member having a proximal end and a distal end; an outer tubularmember disposed about the inner tubular member, the outer tubular memberhaving a proximal end and a distal end, the distal end of the innertubular member and the distal end of the outer tubular member defining atrocar the nozzle arranged therebetween. The trocar seal nozzlearrangement introduces a wall of fluid material delivered between thedistal end of the inner tubular member and the distal end of the outertubular member. The trocar seal nozzle is preferably of arcuateconfiguration to conform to the tubular members. The inner tubularmember preferably comprises a fluid return channel for insufflationfluid returned from the patient. The trocar seal nozzle comprises apressurized fluid seal for penetration by a surgical instrument during asurgical procedure upon the patient. At least one of the tubular membershas a pressure sensor arranged with a fluid pressure source to controlfluid introduction into the patient. The pressurized fluid sealpreferably comprises a wall of pressurized air. The wall of pressurizedair is preferably of generally conical shape. A regulatable pressurizedsource is preferably in communication with the outer tubular member. Thetrocar seal nozzle may be adjustable. The inner tubular member may berotatably adjustable with respect to the outer tubular member. The innertubular member is preferably longitudinally adjustable with respect tothe outer tubular member. The inner tubular member and the outer tubularmember preferably have an annular space therebetween defining a plenumchamber for introduction of pressurized fluid from a pressurized fluidsource in communication with the plenum chamber to a fluid dischargenozzle at the distal end of the trocar assembly to create a wall ofpressurized fluid for sealing the trocar assembly. A flexible sleeve maybe attached to the proximal end of the inner tubular member, the sleevebeing arranged for receipt of a surgeon's forearm during manipulation ofa surgical instrument through the trocar assembly and within thepatient. The insufflation fluid comprises an instrument seal for theassembly.

The invention also may comprise a method for providing a pressurizedinsufflation fluid into a patient cavity and for providing sealableaccess to the patient cavity during a procedure with a surgicalinstrument, comprising: placing an inner tubular member having aproximal end and a distal end into an outer tubular member, the outertubular member having a proximal end and a distal end, the distal end ofthe inner tubular member and the distal end of the outer tubular memberdefining a trocar seal nozzle arranged therebetween; forming an arcuateopening between the distal ends of the inner tubular member and theouter tubular member to comprise the nozzle; introducing a pressurizedfluid into the outer tubular member; and discharging the pressurizedfluid out of the nozzle at the distal end of the tubular members to forma wall of pressurized fluid to seal the trocar assembly during anysurgical procedure performed therewith. The method may include:introducing a surgical instrument into the inner tubular member;extending the surgical instrument through the wall of pressurized fluidand into the cavity of the patient for surgical use therewithin;controlling the pressure, temperature and/or content of the pressurizedfluid introduced through the nozzle and into the patient by a fluidcontrol and fluid sensor feedback arrangement in communication with thefluid introduced into the patient; placing a plurality of spacersbetween the inner tubular member and the outer tubular member tomaintain alignment therebetween. The surgical instrument introduced intothe patient through the inner tubular member of the trocar assembly maycomprise a catheter. The surgical instrument introduced into the patientthrough the inner tubular member may comprise a pair of scissors. Themethod may include removing a tissue sample from the patient byretraction of the sample through the wall of pressurized fluid at thedistal end of the trocar assembly; changing the nozzle configuration byadjustment of the inner tubular member with respect to the outer tubularmember; rotating the inner tubular member with respect to the outertubular member to effect the changing of the nozzle configuration. Thesurgical procedure may comprise tying a suture within the patient. Themethod may include attaching a flexible sleeve to the proximal end ofthe inner tubular member for enclosed receipt of a surgeon's forearm.

The invention may include a method of sealing a trocar assembly within acavity of a patient during a surgical procedure by an instrument withinthat cavity of the patient, comprising: introducing a pressurized airthrough a plenum in the trocar assembly to form a wall of air within thecavity of the patient to seal the cavity from excessive loss of airpressure within the cavity of the patient; piercing the wall of air bythe instrument during the surgical procedure; maintaining a generallyconstant pressure within the cavity of the patient by supplying aconstant flow of pressurized air through the plenum in the trocarassembly and into the cavity of the patient; manipulating the medicalinstrument with respect to the trocar assembly in the absence ofinterference by the trocar assembly with the instrument.

The invention may also include a surgical method including the steps ofpiercing the wall of air by the instrument during the surgicalprocedure; maintaining a generally constant pressure within the cavityof the patient by supplying a constant flow of pressurized air throughthe plenum in the trocar assembly and into the cavity of the patient;manipulating the medical instrument with respect to the trocar assemblyin the absence of interference by the trocar assembly with theinstrument, wherein a spiral groove may be arranged on an inner surfaceof an inner tubular member of the assembly; arranging a duckbill typevalve at a proximal location of the inner tubular member to minimizesplashing of exiting gas and liquid thereat;

The invention may also comprise a trocar assembly for providing apressurized insufflation fluid into a patient cavity and sealable accessto the patient cavity concomitantly using one or more surgicalinstruments simultaneously in the patient, comprising: an inner tubularmember having a proximal end and a distal end; an outer tubular memberdisposed about the inner tubular member, the outer tubular member havinga proximal end and a distal end, the distal end of the inner tubularmember and the distal end of the outer tubular member defining a trocarfluid seal nozzle arranged therebetween wherein a controlled pressurizedfluid is supplied between the outer tubular member and the inner tubularmember at or near a proximal end thereof for introduction into a patientthrough the generally annular nozzle at a distal end of the trocarassembly. The one or more surgical instruments may be comprised of atissue grasping instrument and a tissue cutting instrument.

The invention may also comprise a method of surgically operating upon apatient, comprising one or more of the steps of: inserting a hollow,tubular trocar assembly through an abdominal opening in the patient;introducing a wall of pressurized fluid into the patient preferably viaa generally annular nozzle arranged at a distal end of the trocarassembly; introducing at least one surgical instrument through thehollow tubular trocar assembly and into the patient through the wall offluid; arranging a flexible arm receiving sleeve at a proximal end ofthe trocar assembly, the sleeve receiving a forearm of an operatingsurgeon therethrough. The method may include the steps of: adjusting adimension of the annular nozzle to effect a change of fluid flowthrough; arranging a spiral groove on an inner surface of the innertubular member of the trocar assembly to effect fluid flow exiting fromthe trocar assembly inserted in the patient; separating the fluid flowexiting from the trocar assembly into a gas, a liquid and/or a particlecollection for evaluation of those components. The trocar assembly maybe preferably comprised of an inner tubular member and an outer tubularmember generally concentric therewith. The pressurized fluid preferablycomprises a gaseous substance. The inner tubular member preferably hasan inner surface which has an array of spiral groove arranges therein topermit fluid and particle separation thereby upon exiting of thepressurized fluid max through said trocar assembly. An annularcollection reservoir is preferably arranged at a proximal end of aninnermost tubular member of the trocar assembly. The trocar assemblypreferably includes a duckbill valve at a proximal end of the trocarassembly at an inner tubular member therewithin, for further sealing ofa surgical instrument therethrough. The generally annular nozzle is influid communication with a plenum chamber arranged between an innertubular member and an outer tubular member of the trocar assembly. Thegenerally annular nozzle arranged at the distal end of the trocarassembly preferably has a plurality of guide vanes spaced therearound.

BRIEF DESCRIPTION OF THE DRAWINGS

The objects and advantages of the present invention will become moreapparent when viewed in conjunction with the following drawings inwhich:

FIG. 1 is a schematic representation of a trocar assembly utilizedwithin the exemplary abdominal cavity of a patient;

FIG. 2 is a side elevational view, in longitudinal section, of thedistalmost end of a trocar assembly constructed according to theprinciples of the present invention;

FIG. 3 is a perspective view with portions cut away, of the distalmostend of the trocar assembly of the present invention;

FIG. 4 is a side elevational view of the adjustability arrangement ofthe inner tubular member relative to the outer tubular member of thetrocar assembly, to permit longitudinal movement and hence flowadjustment to device's downstream annular valve arrangement;

FIG. 5 a through FIG. 5 k represents a cross-sectional view of the innerand outer tubular members having various medical instruments beingutilized therethrough;

FIG. 6 represents a cross-sectional view of the trocar with a flexible,generally fluid tight sleeve attached to the upper or proximalmost endthereof for receipt of the surgeon's forearm, to permit generallyfluid-tight manipulation of an instrument within the patient;

FIG. 7 is a side elevational view representing grooves in the innertubular member with the separation of liquid and gas thereby;

FIG. 8 is a view taken along the lines 8-8 of FIG. 7; and

FIG. 9 is a side elevational view of the inner tubular member showing aduck-bill type valve arranged therein.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring now to the drawings in detail, and particularly to FIG. 1,there is shown the present invention which comprises a continuous gasflow trocar assembly 10 which provides a completely open aperture 12 forthe introduction of a surgical instrument “I” and its access to theperitoneum “P” without any physical contact between the innermostsurface of the trocar assembly 10 and the surgical instrument “I” beingintroduced therewithin or withdrawn therefrom. Use of the trocarassembly 10 would also include the use of an obturator (not shown forclarity) to pierce the patient's abdomen to permit the access into thepatient via the trocar assembly 10. The trocar assembly 10 of thepresent invention comprises an elongated outer tubular member (cannula)14 having a first or proximal end 16 and a second or distal end 18. Theassembly 10 includes an internal tubular member 20, having an openproximal end 22 and an open distalmost end 24, the internal tubularmember 20 defining an innermost instrument introduction channel 21. Theopen proximal end 22 also comprises an access port as describedherebelow. An annular seal 26 is disposed between the outer tubularmember 14 and the outer walls of the inner tubular member 20 at theproximal end of the trocar assembly 10, as represented in FIG. 1.

An insufflation fluid/gas flow supply conduit 28 is in fluidcommunication with the annular plenum chamber 30 arranged between theouter surface of the inner tubular member 20 and the inner surface ofthe outer tubular member 14. Pressurized fluid/gas “G”, which may betinted, heated, chilled, humidified, de-humidified or treated with amedicament, is thus presented to the plenum chamber 30 of the continuousgas flow trocar assembly 10 via the insufflation gas conduit 28 from aregulatably controllably, pressurized source 32 for introduction intothe peritoneum “P” of a patient. The insufflation fluid/gas “G” thusflows through the annular chamber 30 between the inner and outer tubularmembers 20 and 14 and is discharged into the peritoneum “P” of thepatient through, in one preferred embodiment, a generally adjustableannular nozzle 36 arranged at the second or distal end 18 and of thetrocar assembly 10. The distal end 18 of the trocar assembly 10 definesthe annular fluid flow nozzle arrangement 36, as is more clearlyrepresented in FIGS. 2 and 3. In one preferred embodiment of the nozzlearrangement 36, an array of radially outwardly extending fluid directingspacers, vanes or jets 38 are arranged to direct theinsufflation/treatment fluid/gas “G” flowing therethrough, in acylindrical stream in the annular plenum chamber 30 and through theannular nozzle arrangement 36 to discharge therefrom, as for example, ina cylindrically (preferably cone) shaped gas stream or wall of fluid orgas 40 exiting the annular arrangement of arcuate openings 37 betweenthose jets or vanes 38.

In this continuous gas flow trocar assembly 10, the force produced bythe jet fluid is counterbalanced by the pressure inside the peritoneum“P” of the patient as sensed by a pressure sensor 42, extending into theperitoneum “P”, as represented in FIG. 1. The pressure sensor 42 is inproper communication with the computer controlled pressure source 32 bya communication line 44. This balance is achieved when the abdominalpressure by the inflow of insufflation fluid/gas “G” is reduced untilthe desired peritoneal pressure just balances the inlet air flow forceas generated by the pressure source 32. The inlet fluid/gas “G” flowwill maintain the correct insufflation pressure within the patient'sabdomen and may be automatically controlled by computer means with thepressure source 32 so as to adjust to fluid/gas flow to allowlaparoscopic medical instruments to be passed through the inner tubularmember 20 into the peritoneum and to be retrieved from the abdomenthrough that inner tubular member 20 of the trocar assembly 10. In afurther embodiment, a pressure sensor 43 may be arranged within theinner tubular member 20 or within the outer tubular member 14, or both,as represented in FIG. 1. Outflow of returned pressurized fluid/gas “R”is effected between the medical instrument “I” within the inner tubularmember 20 and the inner walls of the inner tubular member 20 and exitingout the access port 22 at the proximal end 16 of the trocar assembly 10,as represented by the letter “R” in FIG. 2.

The (those) medical instrument(s) “I” accessing the peritoneum throughthe inner tubular member 20 of the trocar assembly 10 and into thepatient merely passes through the gaseous fluid wall 40 created by thepressurized fluid forced through the annular nozzle arrangement 36 atthe distalmost end 18 of the trocar assembly 10. Manipulation of that(those) medical instrument(s) “I” is (are) not interfered with nor isremoval of any tissue through that inner tubular member 20 hindered inany way by any trap door or overlapping seal arrangement typical of theprior art. The cannula or inner tubular member 20 may be movablerelative to the outer tubular member 14 of the trocar assembly 10, aswill be described more fully hereinbelow, to permit a slight changing ofthe flow of gases “G” through the annular nozzle 36 arranged within thedistal end 18 of the trocar assembly 10.

In a further preferred embodiment of the present invention, a pluralityof short, spaced apart, slidably engaging arcuate screw threads 46 and48 may be arranged on the outer surface 50 of the inner tubular member20 and the inner surface 52 of the outer tubular member 14,respectively. Rotation of the inner tubular member 20 with respect tothe outer tubular member 14 by the attending surgeon as indicated by thearrow “T”, in FIG. 4, would in this embodiment, effect longitudinaladjustment between the inner tube 20 and the outer tube 14, as indicatedby the arrow “L” for adjusting the nozzle 36. The adjustment is effectedby effecting dimensional changes in the spacing between the surfaces 54and 56 comprising the arcuate segments of the nozzle 36, which gap forsuch nozzle 36 may for example be about 0.006 inches. Such dimensionalchanges in the nozzle 36 would change the locus of the fluid/gas wall 40developed at the distal end 18, of the trocar assembly 10, asrepresented in FIG. 4.

A sectional representation of the inner and outer tubular members 20 and14 of the trocar assembly 10 are shown in FIGS. 5 a through 5 k. FIG. 5a discloses the inner tube 20 spaced apart and arranged within the outersleeve or tube 14, the outer tube having for example, an outer diameterof about 7 mm., the inner tubular member 20 having an operating channeldiameter of about 5 mm., the discharge return gas “R” passing proximallybetween the inner wall 21 of the inner tube 20 and the instrument “I”.FIG. 5 b represents the inner and outer tubular members 20 and 14, withan instrument “I” of less that 5 mm. operatively arranged therewithin.FIG. 5 c represents the inner and outer tubular members 20 and 14utilized with a flexible catheter 60, for example, a cholangiogramcatheter.

FIG. 5 d represents the inner and outer tubular members 20 and 14 beingutilized with multiple instruments 62 and 64, for example, a 2.2 mmscissors and a 2.2 mm. grasper, such that a single trocar assembly 10may permit two or more instruments to be passed through the flow offluid comprising the fluid wall 40, wherein the operating surgeon(s) maywork each instrument simultaneously through a single trocar. FIG. 5 erepresents the inner and outer tubular members 20 and 14 utilized withan instrument 66 having a shaft of irregular cross-sectional shape. FIG.5 f represents the inner and outer tubular members 20 and 14 receiving asharp tipped instrument 68 therethrough, such as for example, a pair ofscissors. FIG. 5 g represents the inner and outer tubular members 20 and14 having a spring loaded instrument 70 (Nitinol/stainless steel or thelike) that may for example, activate a mechanical/plastic seal. FIG. 5 hrepresents a tissue specimen 72 being removed through the inner tubularmember 20 without the need for mechanical disengagement/engagement of amechanical seal. The inner channel 21 of the inner tubular member 20 itis to be noted, is self clearing of debris by virtue of the returnfluid/gas “R” flowing therewithin. FIG. 5 i represents the inner andouter tubular members 20 and 14 permitting the introduction of anirregularly shaped surgical material 74, such as a sponge or a prolenemesh for hernia repairs or the like. FIG. 5 j represents the inner andouter tubular members 20 and 14 for sutures 76 to be externalized forknot tying and knot advancement in the surgical field. FIG. 5 krepresents the inner and outer tubular members 20 and 14 arranged toallow a suture 78 and an instrument 80 to be utilized concurrently.

A yet further preferred embodiment of the present invention of thetrocar assembly 10 relating to hand assisted laparoscopic surgery isrepresented in FIG. 6. As shown there, an expanded/expandable flexiblesleeve extension 90 having a first end 92 arranged onto the proximal end22 of the trocar assembly 10, the sleeve extension 90 having a secondend 94 snugly arranged about the operating surgeon's forearm. Aninstrument “I” is shown as manipulable through the inner tubular member20, providing a sealing to the returning fluid/gas “R”. The surgeon thushaving full tactile response to the manipulation of that instrument “I”through a universal seal (a wall of fluid/gas, related to the Coandaeffect), while maintaining an equilibrium of pneumoperitoneum pressureof about 28 to 30 mm., without that instrument having any touching orinterference by engagement with the walls or any hard seal mechanism ofthe trocar assembly common in the prior art.

FIG. 7 shows a further embodiment of the inner tubular member 100 havingan arrangement of spiral lands and grooves 102 disposed on the innersurface thereof to cause the exhaust gas flow to rotate as it passes outthrough the trocar 100. This rotation causes liquid droplets andparticulates “P” to separate out of the axial gas flow “G” due tocentripetal forces. These droplets collect on the inner surface of thetrocar 100. The general gas flow towards the proximal end of the trocar100 will drive the collected matter towards the proximal end of theinner tube 100 to a collection annulus 104 at the proximalmost end ofthe trocar 100. A drain tube or egress port 105 may be arranged topermit this material to exit the working area to a collection reservoiror pad (not shown).

FIG. 8 is a cross-sectional view of the inner tubular member 100 withits internal grooves 102, and also showing the location of the annularnozzle segments 37, and the outer tubular member 14. FIG. 9 shows arepresentation of an inner tubular member/cannula 106 with a duckbillvalve 108 arranged on/near the proximal end thereof. The duck bill valve108 prevents splash of liquid and particular matter and undesired gasflow from exiting the proximal end of the inner tubular member 106.

1. A trocar assembly for providing a pressurized insufflation fluid intoa patient cavity and sealable access to said patient cavity by asurgical instrument, comprising: a) an inner tubular member having aproximal end portion and a distal end portion; b) an outer tubularmember disposed about the inner tubular member, the outer tubular memberhaving a proximal end portion and a distal end portion, the distal endportion of the inner tubular member and the distal end portion of theouter tubular member defining a trocar fluid seal nozzle arrangedtherebetween.
 2. The trocar assembly as recited in claim 1, wherein thetrocar fluid seal nozzle arrangement introduces a wall of fluid materialdelivered between the distal end portion of the inner tubular member andthe distal end portion of the outer tubular member.
 3. The trocarassembly as recited in claim 1, wherein the trocar fluid seal nozzle isof arcuate configuration to conform to said the inner and outer tubularmembers.
 4. The trocar assembly as recited in claim 1, wherein the innertubular member includes a fluid return channel for insufflation fluidreturned from the patient.
 5. The trocar assembly as recited in claim 1,wherein the inner tubular member has an inner surface with a spiralgroove arrangement disposed thereon.
 6. The trocar assembly as recitedin claim 1, wherein the inner tubular member has a valve arrangementdisposed across a proximal end portion thereof.
 7. The trocar assemblyas recited in claim 6, wherein the valve on the proximal end portion ofthe inner tubular member includes a duck bill valve.
 8. The trocarassembly as recited in claim 1, wherein the trocar fluid seal nozzleprovides a pressurized fluid seal for penetration by a surgicalinstrument during a surgical procedure upon the patient.
 9. The trocarassembly as recited in claim 1, wherein at least one of the inner andouter tubular members has a pressure sensor arranged with a fluidpressure source to control fluid introduction into the patient.
 10. Thetrocar assembly as recited in claim 8, wherein the pressurized fluidseal defines a wall of pressurized air.
 11. The trocar assembly asrecited in claim 10, wherein the wall of pressurized air is generallyconical in configuration.
 12. The trocar assembly as recited in claim 1,including a regulatable pressurized source in communication with theouter tubular member.
 13. The trocar assembly as recited in claim 1,wherein the trocar fluid seal nozzle is adjustable.
 14. The trocarassembly as recited in claim 13, wherein the inner tubular member isrotatably adjustable with respect to the outer tubular member.
 15. Thetrocar assembly as recited in claim 13, wherein the inner tubular memberis longitudinally adjustable with respect to the outer tubular member.16. The trocar assembly as recited in claim 1, wherein the inner tubularmember and the outer tubular member have an annular space therebetweendefining a plenum chamber for introduction of pressurized fluid from apressurized fluid source in communication with the plenum chamber to afluid discharge nozzle at the distal end portion of the trocar assemblyto create a wall of pressurized fluid for sealing the trocar assembly.17. The trocar assembly as recited in claim 1, including a flexiblesleeve attached to the proximal end portion of the inner tubular member,wherein the sleeve is arranged for receipt of a surgeon's forearm duringmanipulation of a surgical instrument through the trocar assembly andwithin the patient.
 18. The trocar assembly as recited in claim 1,wherein the insufflation fluid defines an instrument seal for the trocarassembly. 19-50. (canceled)
 51. An access device for use in a surgicalprocedure within a body cavity, comprising: a) an inner tubular memberhaving opposed proximal and distal end portions; b) an outer tubularmember having opposed proximal and distal end portions; and c) a nozzledefined between the inner and outer tubular members for dischargingpressurized fluid.
 52. An access device as recited in claim 51, whereina pathway is defined between the inner and outer tubular members fordirecting pressurized fluid to the nozzle.
 53. An access device asrecited in claim 52, further including inlet means for receivingpressurized fluid from a fluid source, wherein the inlet means is influid communication with the pathway defined between the inner and outertubular members.
 54. An access device as recited in claim 51, whereinthe nozzle is adapted and configured to introduce pressurized fluid intoa body cavity.
 55. An access device as recited in claim 51, wherein thenozzle is adapted and configured to develop a pressurized fluid sealaround a surgical instrument introduced into the body cavity through thetrocar.
 56. An access device as recited in claim 51, further comprisinga fluid return channel for accommodating the return of pressurized fluidfrom a body cavity.
 57. An access device as recited in claim 51, furthercomprising a pressure sensor for measuring fluid pressure within a bodycavity.
 58. An access device as recited in claim 51, wherein the nozzleis arranged in a circumferential manner relative to a longitudinal axisof the trocar.
 59. An access device as recited in claim 58, wherein thenozzle is arranged in such a manner so as to direct pressurized fluidtoward the longitudinal axis of the trocar.
 60. An access device asrecited in claim 58, wherein the nozzle is associated with the distalend portions of the inner and outer tubular members.
 61. An accessdevice as recited in claim 60, wherein the nozzle is formed at thedistal end portions of the inner and outer tubular members.
 62. Anaccess device as recited in claim 51, wherein the nozzle includes anannular array of fluid directing jets.